yeh only chr consts fn

twasm/asm/main.asm

@@ -732,8 +732,7 @@ tokenise:
 ; | 0x00 | 0x | hexidecimal  |
 ; | 0x01 | 0q | octal        |
 ; | 0x02 | 0b | binary       |
-; | 0x03 | '' | ascii char   |
+; | 0x03 | "  | char         |
-; | 0x04 | "" | ascii string |
 ; | 0xFF |    | unrecognised |
 ;
 ; where `p.` is the prefix or otherwise indicator
@@ -763,19 +762,12 @@ evaluate_constant:
   cmp dl, '0'
   je .numeric
 
-  ; char case
+  ; chr case
   mov rcx, 0x03
   push rcx
-  cmp dl, "'"
-  je .chr
-  pop rcx
-
-  ; str case
-  mov rcx, 0x04
-  push rcx
   xor ecx, ecx ; rcx = number of times right-rolled
   cmp dl, '"'
-  je .str
+  je .chr
   pop rcx
 
   jmp .unrecognised
@@ -874,26 +866,9 @@ evaluate_constant:
     jmp .bin_loop
 
   .chr:
-    mov al, [rdi]
+    ; TODO range check rcx
-
-    ; bound check byte as printable char
-    cmp al, 0x20
-    jl .unrecognised
-    cmp al, 0x7E
-    jg .unrecognised
-
-    dec rsi
-    inc rdi
-    mov dl, [rdi]
-    cmp dl, "'"
-    jne .unrecognised
-
-    jmp .break
-
-  .str:
-    ; TODO range check rcx / return string longer as a register
     cmp rsi, 1 ; range check
-    je .str_break
+    je .chr_break
 
     ror rax, 8
     inc rcx
@@ -911,16 +886,16 @@ evaluate_constant:
     dec rsi
     inc rdi
 
-    jmp .str
+    jmp .chr
 
-  .str_break:
+  .chr_break:
     cmp rcx, 1             ; for each [1..rcx]
-    jle .str_break_for_good
+    jle .chr_break_for_good
     rol rax, 8             ; roll left to make up for the roll right earlier
     dec rcx
-    jmp .str_break
+    jmp .chr_break
 
-  .str_break_for_good:
+  .chr_break_for_good:
     mov dl, [rdi]
     cmp dl, '"'
     jne .unrecognised
@@ -932,6 +907,7 @@ evaluate_constant:
     ret
 
   .unrecognised:
+    pop rdx
     mov rdx, 0xFF ; unrecognised type
     ret
 

twasm/asm/tests.asm

@@ -370,21 +370,13 @@ test_evaluate_constant:
 
   ; char
   mov rdi, .case0c
-  mov rsi, 3
+  mov rsi, 6
   call evaluate_constant
   cmp rax, [.case0c_solution]
   jne .fail
   cmp rdx, 0x03
   jne .fail
 
-  ; str
-  mov rdi, .case0s
-  mov rsi, 5
-  call evaluate_constant
-  cmp rax, [.case0s_solution]
-  jne .fail
-  cmp rdx, 0x04
-
   .pass:
     mov rsi, msg_pass
     call print
@@ -402,10 +394,8 @@ test_evaluate_constant:
   .case2h_solution dq 0x1234567890
   .case3h db "0x243F6A8885A308D3"
   .case3h_solution dq 0x243F6A8885A308D3
-  .case0c db "' '"
+  .case0c db '"char"'
-  .case0c_solution dq ' '
+  .case0c_solution dq "char"
-  .case0s db '"str"'
-  .case0s_solution dq "str"
 
   .case0q db "0q31103755242102"
   .case0q_solution dq 0q31103755242102